There is a Harry Potter themed cakes or scenes challenge at sshg_hub [ sshg_hub at Lj].
The idea is to celebrate the 20th anniversary of when Harry Potter and the Philosopher's Stone was first published. Bake, craft, draw, paint/photo manip a Harry Potter cake and take a picture. Just remember you don't need to be a professional chef or artist in order to participate, the idea is that we all have some fun. (I'm planning to bake and decorate a cake even if I'm not an artist AT ALL, even Hagrid bakes better than I do)
Read the "anti-rules" here: Lj or DW . It's all quite simple and easy to do.
I want to thank toblass for picking what it was a very "raw" idea and turn it into a propper challenge!.